Bathtub



FIG. 1 is a top perspective view of a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear being the same as the front; and,

FIG. 4 is a left end elevational view thereof, the right end being the same as the left end. 

The ornamental design for a bathtub, as shown and described. 